(done) openMP学习 (Day14: 总结)

shimly123456

于 2025-02-09 23:33:27 发布

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分类专栏： opeMP学习文章标签：学习数据库 android

本文链接：https://blog.youkuaiyun.com/shimly123456/article/details/145539154

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url: https://dazuozcy.github.io/posts/introdution-to-openmp-intel/#23-%E5%8F%AF%E6%80%95%E7%9A%84%E4%B8%9C%E8%A5%BF%E5%86%85%E5%AD%98%E6%A8%A1%E5%9E%8Batomicsflushpairwise%E5%90%8C%E6%AD%A5%20

新手并行程序员与专家并行程序员之间的区别是专家have a collection of these fundamental design patterns in their minds.

SPMD

Single Program Multiple Data: Run the same program on P processing elements where P can be arbitrarily large.

Use the rank - an ID ranging from 0 to (P-1) - to select between a set of tasks and to manage any shared data structures.

例子：

#include "omp.h"

void main()
{
   
    int i, step;
    double pi = 0.0, sum = 0.0;
    step = 1.0 / (double)num_steps;
    
    #pragma omp parallel firstprivate(sum) private(x, i)
    {
   
        int id = omp_get_threads_num();
        int numprocs = omp_get_num_threads();
        int step1 = id * num_steps / numprocs;
        int stepN = (id+1) * num_steps / numprocs